Verse 32

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गुकारश्चांधकारोहि ।रुकारस्तेजउच्यते ॥अज्ञानग्रासकंब्रह्म ।गुरुरेवनसंशयः ॥

In plain words

The sound gu is darkness, and the sound ru is called fiery light. The guru and no other is the brahman that swallows ignorance; there is no doubt.